Have removed all nuts and bolts from oil pan, but oil pump and transmission will not let oil pan bolt flange pass.
SOURCE: removing water pump 98 buick park avenue
You need to poke a small extension with a 13mm socket through the holes in the power steering pulley, undo it, and slide it back.
SOURCE: 1999 Buick Park Avenue water pump removal
The bolt holding you up is on the bottom by the compressor, right? You Will have to have an inverted torx socket to remove the studs. Also there is a spacer behind the mount bracket, remember where it goes. You will have to pull the pully bolts and get it out of the way too. Some of those cars have plastic elbows going from the intake to the water pump, be carefull with it. Your motor may not have this but be ready to replace it if it does because it will most likley break. Good Luck.
SOURCE: changing rear brake pads on 2002 buick lesabre
Your correct, does hinge on top bolt and then is ussually stiff pulling from pin, but it will move
SOURCE: 1992 Buick LeSabre - Water Pump Bolts Near Engine Mount.
I'm not sure what motor you have in that Buick, but my wife's 92 Old's water pump went out and I had a heck of a time with the bottom two bolts. I talked to a mechanic and he told me to put a piece of wood on top of a floor jack, slide it under the oil pan and lift the motor off it's mounts to gain easier access ,and after I did, with a lot of patience I got the job done.(About 2 hours, a 1/4 turn a a time) I hope this helps
SOURCE: oil and transmission pan bolt torque specs
124 inch lbs on oil pan...Transmission pan 13 ft lbs.
Fig.: 5.0L and 5.8L engine oil pan gaskets and seals
1987 5.8L Engine With 4-Bbl. Carburetor
Under the car.
Inside the engine bay.
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